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US 4,481,989 AGranted
Tree stump extractor
AssigneeReichhold Chemicals, Inc.
InventorEdwin L. Peters
Life of this patent
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AssigneeReichhold Chemicals, Inc.
InventorEdwin L. Peters
Estimating the term…
The apparatus for extracting a tree stump from the ground without the root has a frame including locating means for locating the frame in a predetermined central position on a tree stump. Shearing means oppositely disposed on the frame are pivotable toward each other to cut the tap root of the tree stump in a lateral direction at a predetermined distance below the ground level. The shearing means are pivotable by a first set of hydraulic cylinders and also receive additional movement from a thrust member that moves longitudinally with respect to the frame and engages the shearing members during such longitudinal movement. The thrust member also includes an annular cutter portion for cutting the lateral root of the tree stump substantially simultaneously as the shearing members cut the tap root. In one embodiment of the invention the cutter blades of the shearing members are placed next to each other in substantially continuous line to line contact after total shearing of the tap root of the tree stump. In a further embodiment of the invention the cutter blades each have recesses so that the tree stump is gripped rather than sheared. The latter embodiment permits removal of the tap root portion with the tree stump, while the lateral root portion is cut to remain in the ground.
A tree stump extractor comprising, a frame including locating means for locating said frame in a predetermined position on a tree stump, shearing means pivotable with respect to said frame for movement from a first limit position relative to said frame to a second limit position relative to said frame, first actuating means connected to said frame and said shearing means for pivoting said shearing means relative to said frame, and thrust means moveable with respect to said frame in a first direction for engagement with said shearing means to urge said shearing means to move toward said second limit position.
A tree stump extractor comprising an elongated support member, a pair of oppositely disposed shearing members pivoted to said support member for cutting in a lateral direction with respect to said support member, a thrust member moveably connected to said support member having a depending annular cutting portion for cutting in a predetermined longitudinal direction with respect to said support member, a first pair of actuating members respectively connected to said support member and said shearing members for pivotally moving said shearing members toward and away from each other, said shearing members cutting in a lateral direction when moved toward each other, and a second pair of actuating members respectively connected to said support member and said thrust member for moving said thrust member in said predetermined longitudinal direction.
A method for extracting the stump of a tree from the ground, the tree stump containing lateral roots and a tap root, comprising locating annular cutter means around the periphery of the tree stump in a position substantially coaxial with the axis of the tree stump, forceably moving lateral cutter means from a position above the ground into the ground to laterally shear the tap root below ground, forceably moving the annular cutter means longitudinally of the tree stump into the ground to shear the lateral roots in the ground and lifting the tree stump from the ground whereby it is extracted without the tap root and the lateral roots.
Dependencies are inferred from the claim text.